Packing-expander.



W.- H. LI EBER. PACKING EQIPANDBR. APPLIDATION FILED IBB. 20,1911.

Patented Apr. 2, 1912.

|NVENTDR fill EY% ATT'DFQNIEY.

WITNESSES" I UNITED STATES PATENT OFFICE.

WILLIAM H. LIEBER, OF MILWAUKEE,.WISCONSIN, ASSIG-NOR TO ALLIS-CHALMERS COMPANY, OF MILWAUKEE, WISCONSIN, A CORPORATION OF NEW JERSEY.

PACKING-EXPAND ER.

Specification of Letters Patent.

Patented Apr. 2, 1912.

To all whom it may concern:

Be it known that I, WILLIAM H. LIEBER, a. citizen of the United States, residing at Milwaukee, in the county of Milwaukee and State of-WVisconsin, have invented certain new' and useful Improvements in Packing-Expanders, of which the following is a specification.

This invention relates to improvements in the construct-ion ofkpacking expanders particularly adapted to be used for expandingcup leather packings such as are universally used, for instance, in the brake cylinders of air brakes. v v

. The object of the invention is to provide a packing'expander which is simple in its construction, efficient in its operation,-and which can be easily and cheaply manufactured.

In using packing expanders for expanding cup shaped packings it has been found essential to have the expander coact along the greater part of the cylindrical portion of the packing. Several devices have been devised in which sufficient coaction between the expander and packing is. obtained, but these devices have been diflioult to manufacture since they require either a special stock or a. great amount of machining to produce them. ,A feature of the present invention is to form the expander fromsheet metal and as much as possible by the use of dies,- thereby eliminating to a great extent the.

constructive .difliculties.

For many years, packing expanders for thecup leather packlngs used in brake cylinders of air brakes, have consisted of a lindrical ofthe expander ring. Thousands of air split ringformed of spring wire. This ex-. antler coacted with the cup leather packing neartlie bend thereof and was prevented ,from moving,lfor igitudinally of the 'cy- H ortion of the cup leather by the pistonafol lower which was provided with an, annular recess at 'its periphery adj acent the bend of the packing, to permit insertion brake pistons: thus, constructed have been P c d .on he m. service. a

In; order; to. provide a sheet metal pack ing expander which i'sfinterchangeable' with thehld of spring wire packing ex under ,sq that: the iston followers now in use may still. utilized, provision must bel nade. preventing the expander from arket" and are .at present in" portion of the cup leather due to the large recess formed in the" follower and necessary with the old form of expander ring.

It is an object of the present invention to provide a ring which will be locked against longitudinal shifting and which can be freely substituted for the old form of spring wire expander.

A' clear conception of several embodiments of the invention maybe had by,re- .ferring to the accompanying drawing in which like reference characters designate the same parts in like or different views, although the invention is not ,limited to the particular art selected to illustrate same.

Figure 1 is a fragmentary central vertical section through a brake cylinder, piston and piston packing, showing an expander ring in position. Fig. 2 is a central vertical section through the packing expander ring shown in Fig. 1, the ring being expanded a maximum amount. Fig. 3 is a central vertic'al section through a modification of the packing expander ring, showing the ring expanded a maximum amount and showing also' a modification of the'fOrmation of the-ends of the ring.

The brake cylinder 4:, the end of which is inclosed by a cylinder head 1,,is bored to receive the continuous or circular cup shaped packing 1O composed of leather or other suitable material. The cup packing 10 is clamped along its radial port-ion between the piston 2 and the follower 3. If it is desired to substitute a continuous cylindrical packing for the cup packing 10, such 'substitutepacking can be attached directly to. the'piston periphery. Y The outside diameter of the follower 3 is somewhat less than the internal diameter of the cylindrical 'free' portion 11- of the packing 10, thus forming an annular space between these members. An annular recess '6 isformed in the follower 3 adjacent the piston and nearthe bend of the packing 10 and permits insertion of a wire packing expander ring of the old type within the piston. The discontinuous packing expander ring f5, seeFigsnl' and 2, is formed of sheet metal and is L-shaped in cross section, havin g'itsl'ongerleg extendi-n axially ofthe ring. 1 The shorter. leg] 9 '0 the L extends inwardly into the annular recess formed n the follower 3. Holding p'oints 7, which moving longitudinally of the cylindrical 'are preferably formed by outward punching or distorting the metal forming the body of. the ring 5, extend outwardly from the periphery of the longer leg of'the ring 5. The ends 8 of the discontinuous ring 5 are out along planes parallel to the axis of the-ring. \Yith the ring 5 in position, see Fig. :1,; t=he cylindrical portion or longer leg thereof bears against the cylindrical free portion 11 of the packing 10. The radial leg 9 of the ring 5 coacts against the inwardly projecting fiat portion of the packing 10 and should be free-from coaction with the follower '3. The holding points 7 are embeddedwithin' the cylindrical free portion 11 of the packing 10, thereby positively preventing displacement 9f the packing expander ring 5 axially of the packing 10, thus locking the members together.

In the modified form of discontinuous ex-" pander ring, see Fig. 3, the sheet metal ring 15 is again formed L-shaped in cross section having the short leg 19 extending into the annular recess vof the follower 3, as in the preferred form of ring. Holding lips or projections 17 which are formed directly from the body metal of the ring 15, are adapted to fit in a circular recessnot shown, formed in the cup shaped packing 10. The ends 18 of the discontinuous-ring 15 are cut on planes parallel to the axis of the ring.

. The ends 20 of the ring15 are out along a plane perpendicular to the axis of the ring.

Vith' the ring 15 i'nsertedwithin a piston, the adjacent surfaces 20 coact thereby preventing bunching 0f 'the packing 10 due to inaccuracies in the bore of the cylinder 4.

The longer leg of the ring 15 bearsagainstthe cylindrical free portion 11 of the packing 10, the outward pressure of the ring tending to maintain a tight joint between the packing 10 and cylinder 4. The shorter leg 19 of the ring 15, as shown, coacts against-the radial leg of the packing 10,

' although such coaction is not essential. The

ring 15 is prevented'from longitudinal displacement relative to the packing 10 by the lips or project-ions 17 coacting in the groove formed the packing 10. If the formation of a groove in the packing 10 is undesirable,-the projections 17 canbe formed with knife edges which would ,cut slits in the packing 10 into which the lips 17 would embed themselvesf r i f It will be noted that this expander ring can be very easily constructed with the use of dies, or even by spinning or rolling the ring. The split ring could furthermore be used to replace any of the old forms of wire expander rings without necessitating reconstruction of the parts.

The expander ring 5, 15, 1s inserted in the piston, while'the follower 3 is removed therefrom, by contractingthe ring until the 'pansible packing expander 'rin ends nearlymeet; \Vhile in thiscontracted I condition, the ring 5, 15, is inserted Within the free cylindrical portion 11 of the continuous circular packing 10 until the short leg 9, 19, of the ring 5, 15, abuts against the Hat portion of the packing'lO or piston body.

The discontinuous ring 5, 15, is then permitted to expand until the longer leg'thereof coacts against the free cylindrical portion 11 of the packing, pressing same against the cylinder .wall.

, It should be understood that it is not de-:

sired to be limited to the exact details of construct-ion shown and described, for 'ob-.

vious modifications will occur to a person skilled in the art.

It is claimed and desired to secure by Let ters -Patent-,-- I

1. In combination with a cylindrical packing, a self expansible ring having a cylindrical surface adapted to bear'against said packing, and means on said ringand em-.

bedded in the body of said packing for locking said ring and packing against relative axial displacement.

2. In combination with a cylindrical-packing, a self-expansible ring having a circular peripheral surface adapted to bear against said packing, and means projecting beyond said peripheral surface of said ring and embedded in the body of said packing for locking sa'id'ring and packingagainst relative axial displacement.

3. As an article of manufacture, an exformed from a continuous stripof materlal having at all portions of its length an L-shape cross-section, said ring having projections extending outwardly from its peripheryfor locking said ring to the packing.

4. As an article of manufacture, a sheetmetal packing expander ring formed from l a continuous strip of metal having at all portions of its length an L-shaped cross section, said ring having projections extending from its outer surface for locking said ring to its packing.

5. As an article of manufacture, a. sheet-' metal self-expansible spring packing expander ring having a cylindrical portion,

said-cylindrical portion being distorted to form projections extending beyond the outersurface thereof and adapted to lie-embedded directly in'the packing to lock said ring to its packing. 7

6.111 combination with a continuous cir cula-r packing, a sheet metal spring ring .of I 'L-shaped cross section bearing directly and means formedion said ring and projecting into said packing against saidpacking,

for locking said ring and packing together.

.- 71 In combination, an annularly recessedpiston and having a freeportionextending piston, a circular packing fastened to said expander ring having at all portions thereof -to prevent relative axial displacement of 10 an L-shaped cross-section in contact with said ring packing.

and locked directly to said free portion of In testimony whereof I afiix my signature, said 'paplking, one leg of said Lexten-ding in the presence of'two Witnesses.

into sai recess. I

i 8. In combination with a cylindrical pack- VILLIAM LIEBER ing, an expander ring within said packing, \Vitnesses: V

and means formed integral with said ring CHAS. L. BYRON,

and embedded in the body, of said packing Ron. E. STOLL.

Copies of thil patent may be obtained to: he cents each, by addressing the Commissioner of ratents. walhington, ID. 0. v

It is hereby certified that in Letters Patent No. 1,022,034, granted April 2, 191 2, I upon the application of William H. Lieber, of Milwaukee, Wisconsin, for an improvement in Packing-Expanders, an error appears in the printed specification requiring correction as follows: Page 3, line 11, after .the Word ring insert the word and, and that the said Letters Patent should he read withthis correction therein that the same may conform to the record of the ease in the Patent Office.

Signed and sealed this 23rd day of April, A.. D., 1912.

' [SEAL-1' 1. G. BILLINGS.

Acting Commissioner of Patents.

' expander ring having at all portions thereof -to prevent relative axial displacement of 10 an L-shaped cross-section in contact with said ring packing.

and locked directly to said free portion of In testimony whereof I afiix my signature, said 'paplking, one leg of said Lexten-ding in the presence of'two Witnesses.

into sai recess. I

i 8. In combination with a cylindrical pack- VILLIAM LIEBER ing, an expander ring within said packing, \Vitnesses: V

and means formed integral with said ring CHAS. L. BYRON,

and embedded in the body, of said packing Ron. E. STOLL.

Copies of thil patent may be obtained to: he cents each, by addressing the Commissioner of ratents. walhington, ID. 0. v

It is hereby certified that in Letters Patent No. 1,022,034, granted April 2, 191 2, I upon the application of William H. Lieber, of Milwaukee, Wisconsin, for an improvement in Packing-Expanders, an error appears in the printed specification requiring correction as follows: Page 3, line 11, after .the Word ring insert the word and, and that the said Letters Patent should he read withthis correction therein that the same may conform to the record of the ease in the Patent Office.

Signed and sealed this 23rd day of April, A.. D., 1912.

' [SEAL-1' 1. G. BILLINGS.

Acting Commissioner of Patents.

It is hereby certified that in Letters Patent No. 1,022,034, granted April 2, 1912, upon the application of William H. Lieber, of Milwaukee, Wisconsin, for an improvement in Packing-Expanders, an error appears in the printed specifieation requiring correction as follows: Page 3, line 11, after the word ring insert the word and, and that the said Letters Patent should he read with this oorrection therein that the same may conform to the record of the case in the Patent Oflice.

Signed and sealed this 23rd day of April, A. D., 1912.

C. (J. BILLINGS.

[emu] Acting Commissioner of Patents. 

